Apparatus for lapping rollers



E; G. STRONG APPARATUS FOR LAPPIRG ROLLERS 3119a Nay 29, 1922 2 Sheets-Sheet 2 Patented Mar. 24, 1925.

UNlT'ED- STATES ERNEST G. STRONG, OF CANTON, OHIO, ASSIGNOR TO THE TIMKEN ROLLER; BEARING COMPANY, 01 CANTON, OHIO, A CORPORATION OF OHIO.

APPABATUS FOR .LA IPING ROLLERS;

application filed my 29, 1922. Serial m 564,394.

To rill whom z't-my concern:

Be it known that I, Ennns'r G. STRONG, a

citizen of the United States, and a resident.

to obtain a highly finished roller that will run more quietly than the ground rollers. The invention consists principally in lapping the rollers after hardening the same and also in the apparatus described hereinafter for lapping the same. I

In the accompanying drawing wherein like reference numerals refer to like parts wherever they occur,

Fig. 1, is a plan view of a roll lapping device embodying my invention, the device bein shown m connection with a grinding mac 'ne; s

Fig. 2,is a side elevation thereof;

Fig. 3, is a fragmentary end elevation thereof, the slide bracket being shown partly in section on the line 3-3 in Fig. 1;

' Fig. 4, is an enlarged side elevation of the lap and holdertherefor,

Fig; 5, is a central horizontal section through thelap and lap-holder on the line -5-5 in Fig. i; and Y Fig. 6, is a faceview of the bearing face ef the lap.

Referring to the accompanying drawing, my lapping device is shown in connection with'a grinding machine, only the table 10 and the axially alined rotary work supporting spindles orcenters 11 of .which is shown. The, lapping device comprises a supporting bracket 12, adapted to be bolted or otherwise rigidly secured to'the side of the table 11 of the grinding machine midway of the work supporting spindles '11 thereof.

Mounted in a slideway 13 on the bracket 12, and arranged for a'horizontal sliding movement longitudinally of the work supporting centers 11, is a slide-bracket 14.

This slide-bracket has a horizontal channel.

A, for tapered roller bearings.

formed in its top which extends transversely of the work supporting spindles 11. Arranged within said channel is a block 15 of rectangular section which extends in- I wardly towards the work supporting spindles and is provided with a horizontal bore adapted to slidably support the shank or stem portion 16 of a lap-holder.

The lap-holder projects beyond the forward end of the supporting block 15 and is provided with a bifurcated head portion 16, within which is mounted a lapping tool 17.

The lap 17, is pivotally secured in said head,

for horizontally swinging movement, by means of a vertical pivot pin 18.. An elastic pad 17 is located between the rear end of the lap and the inner wall of the bifurcated head portion of the lap-holder and tends to keep the pivotally mounted lap in a straight position. The bearing end of the lap is shaped to conform to the contour of the Workthatis to be lapped, such work being shown in form of a tapered roller when made ofcast-iron, is preferably formed at, its bearing end with'a series of grooves 19, which are disposed at right angles to each other and form pockets for receiving an abrasive material. When using a lap made of copper or other soft material, the grooves 19 may be omitted.

Movement of the lap-holder towards and away from the work is limited by means of a pin 20, which has a press fit inthe block 15 that projects into a .keyway 21 formed in the rear end portion of theshank 16 of the lap-holder. The forward end portion of the bore in the block 15 is enlarged toreceive The lap,

an expansion spring 22, which surrounds of the lap-holder. Thus, the spring 22 bears against the collar 23 of the lap-holder, therebyl pressing the lap transversely against there ler.

. '105 The tension of the spring 22 is adjust ed, to obtain the required pressure to lap I the roller properly,- by means of adjust-. ing screws 24 and 25 thatv are threaded through the top and rear end-portions, re-

adapted to be driven by a belt 28 and a sure of the lap against the work is obtained by adjusting the screw 25, after which the screw 24 is manipulated to clamp the block in its adjusted position.

Journaled in an upright arm 26 on the table 10 of the machine is an eccentric 27 pul ey 29 from the cam-drivin shaft not shown) of the grinding mac 'ne. urrounding the eccentric 27 is a strap 30 which is connected to the slide-bracket 14 by means of a jointed connecting rod 31. The connectin rod is pivotally connected with the slideracket 14;; and the two sec tions of said rod are connected b a suitable turn-buckle 32, whereby the ength of the rod may be varied. v

The operation ofthe lapping device is as follows:

After being hardened and ound, the rollers that are to be' lapp are automaticall positioned, one at a time, between the wor holding spindles 11 by means of suitable mechanism (not shown) and revolved in the usual manner at high speed. The desired pressure of the lap against the roller is then obtained by adjusting the pressure-of the spring 22 by means of the adjusting screw 25, whereby, the rollrevolves against the bearing end of the lap and is polished by, the moving contact between said rolland said lap. During this operation, a suitable -abrading mixture,

preferably emery flour oil, is supplied to the contacting surfaces of the lap and the roller by means of a suitable feeding device (not shown and the lap isjreciprocated longitudina y of theroller, thereby eliminating the danger of grooving the surface of the roller and insuring even polishing throughout its length. The pivotal mounting of the 'lap permits it to swing on its pivot and accommodate itself to'the surface of the roller.

The principal advantage of the arrangement described is that it produces rollers having accurate surfaces that are olished to a smooth finish, whereby said rol ers will roll more quietly than the ground rollers.

Obviously, the hereinbefore described arrangement admits of considerable modification without departing from the invention; therefore, I do not wish to be limited to the exact arrangement shown and described. o. I

WhatI claim is:

1. A roll lapping machine comprising a rotary roll supporting spindle adapted to rotate a roll on its own axis, a slide-bracket,

means for imparting a continuous reciprocatin movement to said bracket longitudinal ly of the roll-spindle, a block'mounted on said slide-bracket, a lap-holder havin a shank portion slidably mounted on sai block for movement transversely of the rol] axis, a lap mounted on said holder, and a spring bearing against said block and said lap h llder =for pressing said lap transversely aga'nst the surface of the roll.

2. A-roll lapping machine com rising a rotary' roll supporting spindle a apted to rotate a roll on its axis, a slide-bracket, means for imparting a continuous reciprocatin movement to said bracket longitudina y of the roll-spindle, a block mounted on said slide-bracket, a lap-holder having a shank portion slidably mounted on said block for movement transversely of the roll axis, a lap mounted on said holder, a spring sleeved'on the shank portion of said holder and bearing against said block and said tool holder for pressing said la transversely against the surface jof t e roll, and. means for adjusting said spring to regulate the pressure of said lap against said roll. a a

.' Signed at Canton, Ohio, this 24th day of May, 1922.

- ERNEST G. STRONG. 

